www.tinc-vpn.org Git - tinc/blob - src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
   5                   2008      Max Rijevski <maksuf@gmail.com>
   6                   2009      Michael Tokarev <mjt@tls.msk.ru>
   7                   2010      Julien Muchembled <jm@jmuchemb.eu>
   8                   2010      Timothy Redaelli <timothy@redaelli.eu>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License along
  21     with this program; if not, write to the Free Software Foundation, Inc.,
  22     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23 */
  24
  25 #include "system.h"
  26
  27 /* Darwin (MacOS/X) needs the following definition... */
  28 #ifndef _P1003_1B_VISIBLE
  29 #define _P1003_1B_VISIBLE
  30 #endif
  31
  32 #ifdef HAVE_SYS_MMAN_H
  33 #include <sys/mman.h>
  34 #endif
  35
  36 #ifdef HAVE_LZO
  37 #include LZO1X_H
  38 #endif
  39
  40 #ifndef HAVE_MINGW
  41 #include <pwd.h>
  42 #include <grp.h>
  43 #include <time.h>
  44 #endif
  45
  46 #include <getopt.h>
  47
  48 #include "conf.h"
  49 #include "control.h"
  50 #include "crypto.h"
  51 #include "device.h"
  52 #include "logger.h"
  53 #include "names.h"
  54 #include "net.h"
  55 #include "netutl.h"
  56 #include "process.h"
  57 #include "protocol.h"
  58 #include "utils.h"
  59 #include "xalloc.h"
  60
  61 /* If nonzero, display usage information and exit. */
  62 static bool show_help = false;
  63
  64 /* If nonzero, print the version on standard output and exit.  */
  65 static bool show_version = false;
  66
  67 /* If nonzero, use null ciphers and skip all key exchanges. */
  68 bool bypass_security = false;
  69
  70 /* If nonzero, disable swapping for this process. */
  71 static bool do_mlock = false;
  72
  73 /* If nonzero, chroot to netdir after startup. */
  74 static bool do_chroot = false;
  75
  76 /* If !NULL, do setuid to given user after startup */
  77 static const char *switchuser = NULL;
  78
  79 /* If nonzero, write log entries to a separate file. */
  80 bool use_logfile = false;
  81
  82 char **g_argv;                  /* a copy of the cmdline arguments */
  83
  84 static int status = 1;
  85
  86 static struct option const long_options[] = {
  87         {"config", required_argument, NULL, 'c'},
  88         {"net", required_argument, NULL, 'n'},
  89         {"help", no_argument, NULL, 1},
  90         {"version", no_argument, NULL, 2},
  91         {"no-detach", no_argument, NULL, 'D'},
  92         {"debug", optional_argument, NULL, 'd'},
  93         {"bypass-security", no_argument, NULL, 3},
  94         {"mlock", no_argument, NULL, 'L'},
  95         {"chroot", no_argument, NULL, 'R'},
  96         {"user", required_argument, NULL, 'U'},
  97         {"logfile", optional_argument, NULL, 4},
  98         {"pidfile", required_argument, NULL, 5},
  99         {"option", required_argument, NULL, 'o'},
 100         {NULL, 0, NULL, 0}
 101 };
 102
 103 #ifdef HAVE_MINGW
 104 static struct WSAData wsa_state;
 105 CRITICAL_SECTION mutex;
 106 int main2(int argc, char **argv);
 107 #endif
 108
 109 static void usage(bool status) {
 110         if(status)
 111                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 112                                 program_name);
 113         else {
 114                 printf("Usage: %s [option]...\n\n", program_name);
 115                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 116                                 "  -D, --no-detach               Don't fork and detach.\n"
 117                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 118                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 119 #ifdef HAVE_MLOCKALL
 120                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 121 #endif
 122                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 123                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
 124                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 125                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 126 #ifndef HAVE_MINGW
 127                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 128                                 "  -U, --user=USER               setuid to given USER at startup.\n"
 129 #endif
 130                                 "      --help                    Display this help and exit.\n"
 131                                 "      --version                 Output version information and exit.\n\n");
 132                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 133         }
 134 }
 135
 136 static bool parse_options(int argc, char **argv) {
 137         config_t *cfg;
 138         int r;
 139         int option_index = 0;
 140         int lineno = 0;
 141
 142         cmdline_conf = list_alloc((list_action_t)free_config);
 143
 144         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
 145                 switch (r) {
 146                         case 0:   /* long option */
 147                                 break;
 148
 149                         case 'c': /* config file */
 150                                 confbase = xstrdup(optarg);
 151                                 break;
 152
 153                         case 'D': /* no detach */
 154                                 do_detach = false;
 155                                 break;
 156
 157                         case 'L': /* no detach */
 158 #ifndef HAVE_MLOCKALL
 159                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 160                                 return false;
 161 #else
 162                                 do_mlock = true;
 163                                 break;
 164 #endif
 165
 166                         case 'd': /* inc debug level */
 167                                 if(optarg)
 168                                         debug_level = atoi(optarg);
 169                                 else
 170                                         debug_level++;
 171                                 break;
 172
 173                         case 'n': /* net name given */
 174                                 netname = xstrdup(optarg);
 175                                 break;
 176
 177                         case 'o': /* option */
 178                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 179                                 if (!cfg)
 180                                         return false;
 181                                 list_insert_tail(cmdline_conf, cfg);
 182                                 break;
 183
 184 #ifdef HAVE_MINGW
 185                         case 'R':
 186                         case 'U':
 187                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 188                                 return false;
 189 #else
 190                         case 'R': /* chroot to NETNAME dir */
 191                                 do_chroot = true;
 192                                 break;
 193
 194                         case 'U': /* setuid to USER */
 195                                 switchuser = optarg;
 196                                 break;
 197 #endif
 198
 199                         case 1:   /* show help */
 200                                 show_help = true;
 201                                 break;
 202
 203                         case 2:   /* show version */
 204                                 show_version = true;
 205                                 break;
 206
 207                         case 3:   /* bypass security */
 208                                 bypass_security = true;
 209                                 break;
 210
 211                         case 4:   /* write log entries to a file */
 212                                 use_logfile = true;
 213                                 if(optarg)
 214                                         logfilename = xstrdup(optarg);
 215                                 break;
 216
 217                         case 5:   /* open control socket here */
 218                                 pidfilename = xstrdup(optarg);
 219                                 break;
 220
 221                         case '?': /* wrong options */
 222                                 usage(true);
 223                                 return false;
 224
 225                         default:
 226                                 break;
 227                 }
 228         }
 229
 230         if(!netname && (netname = getenv("NETNAME")))
 231                 netname = xstrdup(netname);
 232
 233         /* netname "." is special: a "top-level name" */
 234
 235         if(netname && (!*netname || !strcmp(netname, "."))) {
 236                 free(netname);
 237                 netname = NULL;
 238         }
 239
 240         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 241                 fprintf(stderr, "Invalid character in netname!\n");
 242                 return false;
 243         }
 244
 245         return true;
 246 }
 247
 248 static bool drop_privs(void) {
 249 #ifndef HAVE_MINGW
 250         uid_t uid = 0;
 251         if (switchuser) {
 252                 struct passwd *pw = getpwnam(switchuser);
 253                 if (!pw) {
 254                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 255                         return false;
 256                 }
 257                 uid = pw->pw_uid;
 258                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 259                     setgid(pw->pw_gid) != 0) {
 260                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 261                                "initgroups", strerror(errno));
 262                         return false;
 263                 }
 264 #ifndef __ANDROID__
 265 // Not supported in android NDK
 266                 endgrent();
 267                 endpwent();
 268 #endif
 269         }
 270         if (do_chroot) {
 271                 tzset();        /* for proper timestamps in logs */
 272                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 273                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 274                                "chroot", strerror(errno));
 275                         return false;
 276                 }
 277                 free(confbase);
 278                 confbase = xstrdup("");
 279         }
 280         if (switchuser)
 281                 if (setuid(uid) != 0) {
 282                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 283                                "setuid", strerror(errno));
 284                         return false;
 285                 }
 286 #endif
 287         return true;
 288 }
 289
 290 #ifdef HAVE_MINGW
 291 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 292 #else
 293 # define NORMAL_PRIORITY_CLASS 0
 294 # define BELOW_NORMAL_PRIORITY_CLASS 10
 295 # define HIGH_PRIORITY_CLASS -10
 296 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 297 #endif
 298
 299 int main(int argc, char **argv) {
 300         program_name = argv[0];
 301
 302         if(!parse_options(argc, argv))
 303                 return 1;
 304
 305         make_names();
 306
 307         if(show_version) {
 308                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 309                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 310                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 311                                 "See the AUTHORS file for a complete list.\n\n"
 312                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 313                                 "and you are welcome to redistribute it under certain conditions;\n"
 314                                 "see the file COPYING for details.\n");
 315
 316                 return 0;
 317         }
 318
 319         if(show_help) {
 320                 usage(false);
 321                 return 0;
 322         }
 323
 324 #ifdef HAVE_MINGW
 325         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 326                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 327                 return 1;
 328         }
 329 #endif
 330
 331         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 332
 333         g_argv = argv;
 334
 335         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 336                 do_detach = false;
 337 #ifdef HAVE_UNSETENV
 338         unsetenv("LISTEN_PID");
 339 #endif
 340
 341         init_configuration(&config_tree);
 342
 343         /* Slllluuuuuuurrrrp! */
 344
 345         srand(time(NULL));
 346         crypto_init();
 347
 348         if(!read_server_config())
 349                 return 1;
 350
 351 #ifdef HAVE_LZO
 352         if(lzo_init() != LZO_E_OK) {
 353                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 354                 return 1;
 355         }
 356 #endif
 357
 358 #ifdef HAVE_MINGW
 359         if(!do_detach || !init_service())
 360                 return main2(argc, argv);
 361         else
 362                 return 1;
 363 }
 364
 365 int main2(int argc, char **argv) {
 366         InitializeCriticalSection(&mutex);
 367         EnterCriticalSection(&mutex);
 368 #endif
 369         char *priority = NULL;
 370
 371         if(!detach())
 372                 return 1;
 373
 374 #ifdef HAVE_MLOCKALL
 375         /* Lock all pages into memory if requested.
 376          * This has to be done after daemon()/fork() so it works for child.
 377          * No need to do that in parent as it's very short-lived. */
 378         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 379                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 380                    strerror(errno));
 381                 return 1;
 382         }
 383 #endif
 384
 385         /* Setup sockets and open device. */
 386
 387         if(!setup_network())
 388                 goto end_nonet;
 389
 390         if(!init_control())
 391                 goto end_nonet;
 392
 393         /* Initiate all outgoing connections. */
 394
 395         try_outgoing_connections();
 396
 397         /* Change process priority */
 398
 399         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 400                 if(!strcasecmp(priority, "Normal")) {
 401                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 402                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 403                                 goto end;
 404                         }
 405                 } else if(!strcasecmp(priority, "Low")) {
 406                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 407                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 408                                 goto end;
 409                         }
 410                 } else if(!strcasecmp(priority, "High")) {
 411                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 412                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 413                                 goto end;
 414                         }
 415                 } else {
 416                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 417                         goto end;
 418                 }
 419         }
 420
 421         /* drop privileges */
 422         if (!drop_privs())
 423                 goto end;
 424
 425         /* Start main loop. It only exits when tinc is killed. */
 426
 427         status = main_loop();
 428
 429         /* Shutdown properly. */
 430
 431         if(debug_level >= DEBUG_CONNECTIONS)
 432                 devops.dump_stats();
 433
 434         close_network_connections();
 435
 436 end:
 437         exit_control();
 438
 439 end_nonet:
 440         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 441
 442         free(priority);
 443
 444         crypto_exit();
 445
 446         exit_configuration(&config_tree);
 447         free(cmdline_conf);
 448         free_names();
 449
 450         return status;
 451 }